My barrel is a 10.5" Noveske and it shoots 208gr Amax's and 240 SMK's fine. I think the AAC Blackout barrels are going to be 16" or 9" and I've not heard of any of those having problems with stabilizing bullets. Short barrels have been used for years with 300 Whisper in the T/C pistols as well.
The length shouldn't be the problem.
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